Drainage formula (Water Overlay)

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Drainage passive: First the flow capacity is calculated Failed to parse (unknown function "\deltat"): {\displaystyle Q_{p,t}=\deltat*q_t/math> The water head at the drainage area is calculated: <math>h_{x,y} = (w_{g,x,y}-z_d)\cdot f_s}


where:

is the ground water level in meters
is the drainage datum height in meters.
is the drainage area size in square meters.
is the average storage percentage of the ground above the drainage.